Heat a pot of water over high heat. Once boiling, cook 1 lb of pasta following the directions on the package. Be sure to reserve 2-3 tbsp of the pasta water. Once pasta is cooked, drain the pasta and set aside.
Heat a large pan over medium-low heat. Add butter, red pepper flakes, and minced garlic. Stir and let cook for about 1 minute.
Add heavy cream, milk, cayenne, smoked paprika, salt, and pepper to the skillet. Stir well and let simmer for about 5 minutes stirring occasionally.
Turn your heat down to low and slowly stir in freshly grated Parmesan cheese. Add 2-3 tbsp of pasta water. Stir the Spicy Alfredo sauce well.
Add cooked pasta and stir until your pasta is well coated in Alfredo sauce. Top with dried parsley, Parmesan cheese, and more red pepper flakes! Enjoy!